Primary Pro Heat Pump Pipe Insulation – External ASHP Insulation System

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Designed by Installers. Built for ASHP Professionals. Primary Pro is the specialist external pipe insulation system developed specifically for air source heat pump (ASHP) installat ions. Unlike standard foam pipe lagging, every Primary Pro product is UV-resistant, 100% waterproof, and weather-proof straight from the box — no painting, no site preparation, no compromise due to weather at the time of install. The range covers every component of a complete external ASHP pipework insulation job: pipe insulation in four bore sizes, pre-made elbows, purpose-made wall sleeves, valve jackets for Intatec antifreeze and lever valves, sealing rings, rubber-lined pipe clips, back plates, Bond & Seal sealant, joint covers, over coat, and the specialist tools (grinder head and diamond core bits) needed for a professional sealed wall penetration. All products are engineered to work together as a coordinated total system. UV & Weather Proof 100% Waterproof ASHP Specialist Range Part L & MCS Compliant Total Installer System Intatec Approved Pipe Insulation Primary Pro insulation is manufactured from a closed-cell foam core with a proprietary UV-stable, waterproof outer coating applied at the factory. Available in four bore sizes, all cut to 1 metre lengths (42mm also available in 500mm). Each length can be cut or mitred on site to suit any run, angle, or external fitting. Insulation should pass through the wall fabric and be sealed with Bond & Seal AS001 for full Part L compliance. Installation Note: Wet insulation conducts heat instead of retaining it. A fully sealed waterproof system is essential for protecting the heat pump's COP and SCOP across the installation's lifetime. Item Code Description Actual OD x Wall Pipe Size / Application AS45 Primary Pro 22mm x 25mm x 1m 23mm x 25mm (+-1mm) 22mm copper — uses same 78mm core bit and clips as 28mm AS022 Primary Pro 28mm x 19mm x 1m 29mm x 21mm (+-1mm) 28mm copper pipe AS033 Primary Pro 35mm x 19mm x 1m 36mm x 21mm (+-1mm) 35mm copper pipe AS042 Primary Pro 42mm x 19mm x 1m 43mm x 21mm (+-1mm) 42mm / 1-1/4" heat pump connections AS043 Primary Pro 42mm x 19mm x 500mm 43mm x 21mm (+-1mm) 42mm / 1-1/4" connections — short runs and tight spaces Pre-Made Elbows (PPEO28 / PPEO35) Factory-mitred 90-degree elbows manufactured from Primary Pro insulation, professionally bonded and sealed. Eliminates on-site mitring at bends, saving time and delivering a consistent finish. Complete the joint with Primary Pro Bond and Seal AS001. Item Code Description For Use With PPEO28 Primary Pro Pre-Made Elbow 28mm 22mm and 28mm insulation (AS45, AS022) PPEO35 Primary Pro Pre-Made Elbow 35mm 35mm insulation (AS033) Insulation Jackets — Intatec Antifreeze Valves (AS32 / AS52) Developed in collaboration with Intatec, these factory-made Primary Pro insulation shells provide a precise, quick-fit covering for Intatec antifreeze valves on external ASHP pipework. UV-protected and weather-resistant. Seal all joints with Bond and Seal AS001. Item Code Fits Valve Connection Size AS32 Intatec 28mm (1") Antifreeze Valve 1" / 28mm compression AS52 Intatec 35mm (1-1/4") Antifreeze Valve 1-1/4" / 35mm compression Insulation Jackets — Intatec Flat Face Lever Ball Valves (AS33 / AS53) Purpose-made Primary Pro insulation shells for Intatec flat face lever ball valves on external ASHP installations. Designed for speed on site — particularly useful when working against the weather. UV and weather resistant. Seal with Bond and Seal AS001. Item Code Fits Valve Connection Size AS33 Intatec 28mm (1") Flat Face Lever Ball Valve 1" / 28mm AS53 Intatec 35mm (1-1/4") Flat Face Lever Ball Valve 1-1/4" / 35mm Wall Sleeves (PS028 / PS035) Standard plastic pipe sleeves are not designed for insulated ASHP pipework — they are either too small or too large. Primary Pro Sleeves are purpose-sized to fit Primary Pro insulated pipework through a wall core, protecting the insulation from debris, mortar chemicals, and moisture. Seal with Bond and Seal after installation. Item Code Fits Insulation Required Core Drill PS028 22mm and 28mm Primary Pro insulated pipework 78mm (DC78) PS035 35mm Primary Pro insulated pipework 91mm (DC91) Sealing Rings — Pack of 10 (AS35 / AS36) Used with Bond and Seal to create a clean, weatherproof, airtight seal around the insulated pipework at the wall exit point. For the best result, use the Primary Pro Grinder Head AS34 first to grind a 4mm flat indentation in the wall face — the sealing ring then sits flush for a professional seal that prevents heat loss, draughts, moisture ingress, and insect entry. Item Code Fits Insulation Pack Quantity AS35 22mm and 28mm Primary Pro insulation Pack of 10 AS36 35mm Primary Pro insulation Pack of 10 Rubber-Lined Clips and Back Plates ASHP insulated pipework must be clipped around the outside of the insulation — not clamped to the pipe itself — to prevent compressing the insulation, creating cold bridges, or trapping moisture. Primary Pro rubber-lined clips are sized for the insulated OD. The rubber lining protects the insulation from direct metal contact, especially important in direct sunlight when metal clips can heat up and adhere to the surface. Minimum one clip per metre run. Item Code Product Notes AS008 / AS018 Primary Pro Rubber-Lined Clips Sized for Primary Pro insulated OD; rubber lining prevents heat damage and adhesion to insulation surface AS050 Easy Fix Back Plate Single fixing point for two clips — up to 5x faster than traditional back plates; spaces pipework from wall for airflow and maintenance access AS009 Standard Back Plate (Male M10 BZP) Traditional individual mounting per clip; M10 BZP male fixing Joint Covers — Straight and Elbow Applied over Bond and Seal-sealed insulation joints for additional protection against weather and thermal movement. Suitable for new installations and annual maintenance inspections where joints need reinforcement. Item Code Type For Insulation Size JC28 Straight Joint Covers (pack of 20) 28mm insulation JC35 Straight Joint Covers (pack of 20) 35mm insulation EJC28 Elbow Joint Covers (10 pairs) 28mm insulation EJC35 Elbow Joint Covers (10 pairs) 35mm insulation Bond and Seal 290ml — AS001 Specialist hybrid polymer sealant in a standard 290ml mastic gun cartridge. Deep black finish blends with Primary Pro insulation. Used to seal all insulation joints, wall penetrations (around sleeves and sealing rings), and the insulation-to-heat pump connection. Remains flexible when cured — expands and contracts with temperature changes without cracking. Essential for a weatherproof, Part L compliant installation. Important: Always seal the insulation-to-heat pump casing connection with Bond and Seal — heat pump vibration opens unsealed gaps over time, allowing moisture to track inside the insulation. Download the "How to Apply Bond and Seal" guide from primarypro.co.uk before first use. Tools — Grinder Head and Diamond Core Bits Item Code Product Purpose AS34 Primary Pro 100mm Grinder Head Grinds a 4mm flat indentation in stone, render or pebble-dash — allows sealing rings to sit flush for a professional weatherproof wall seal DC78 78mm Diamond Core Bit Correct bore for PS028 sleeve — 22mm and 28mm insulated pipework wall penetrations DC91 91mm Diamond Core Bit Correct bore for PS035 sleeve — 35mm insulated pipework wall penetrations Over Coat (PPOC) — Colour Matching Where a homeowner prefers the external pipework to blend with the property rather than show the standard black insulation finish, Primary Pro Over Coat can be applied after installation to colour-match to brickwork, render, or stonework. Does not affect thermal performance or waterproof integrity. Applied directly to the cured installed insulation surface. Which Products Do I Need? Pipe / Fitting Insulation Sleeve Core Bit Sealing Ring 22mm copper AS45 PS028 DC78 AS35 28mm copper AS022 PS028 DC78 AS35 35mm copper AS033 PS035 DC91 AS36 42mm / 1-1/4" connections AS042 / AS043 — — — Intatec antifreeze valve 1" / 28mm AS32 jacket — — — Intatec antifreeze valve 1-1/4" / 35mm AS52 jacket — — — Intatec flat face lever valve 1" / 28mm AS33 jacket — — — Intatec flat face lever valve 1-1/4" / 35mm AS53 jacket — — — All pipe installations also require: Bond and Seal AS001 | Rubber-lined clips (AS008/AS018) | Back plate (AS050 or AS009) Frequently Asked Questions Why can't standard pipe lagging be used on external ASHP pipework? Standard closed-cell foam lagging degrades under UV exposure — it becomes brittle, cracks, and absorbs moisture. Wet insulation conducts heat rather than retaining it, directly reducing the heat pump's COP and SCOP. It has no integral weatherproof coating, so moisture enters through cuts, joints, and clip holes. For external ASHP pipework exposed to UK weather across a 10-15 year installation lifetime, standard foam lagging is not appropriate. Primary Pro's factory-applied UV-stable waterproof coating addresses all of these failure modes. Is Primary Pro Part L compliant? Yes. Primary Pro insulation meets the Part L Building Regulations requirements for external ASHP pipe insulation and is MCS-compatible. The 19mm wall thickness on 28mm, 35mm, and 42mm bore, and 25mm on 22mm bore, satisfy the external heating pipework requirements. The Bond and Seal sealed system — including the wall penetration — is required for full Part L compliance; unsealed or partial insulation does not satisfy the standard. Do I need to insulate the connection at the heat pump unit itself? Yes — and this is one of the most commonly missed steps. The insulation-to-heat pump casing connection must be sealed with Bond and Seal. The heat pump generates vibration during operation and any unsealed gap will open over time, allowing moisture to track inside the insulation. Bond and Seal remains flexible when cured and accommodates vibration without cracking. How often does Primary Pro insulation need to be maintained? Inspect during the annual heat pump service. If the outer surface shows wear, discolouration, or cracking, apply Primary Pro Maintenance Coat to restore the protective finish. Testing has shown that installations not in direct south-facing sunlight may not require recoating within the first five years. Bond and Seal joints at the wall penetration and heat pump connection should also be checked and touched up if any gap or shrinkage is visible. Can Primary Pro be used alongside Intaflex pre-insulated flexible pipes? Yes — Primary Pro was developed in direct collaboration with Intatec, the manufacturer of Intaflex. The pre-made valve jackets (AS32, AS33, AS52, AS53) are purpose-designed for Intatec external valves used on Intaflex installations. Bond and Seal is suitable for sealing the junction between Intaflex and Primary Pro rigid insulation, and for sealing to the heat pump casing. Primary Pro rigid insulation is used for copper pipe sections of the same installation, giving a consistent appearance and protection standard throughout. Related Products:PrimaryPro 100x Pre-Made Insulation Jacket (Trade Bulk Pack) | PrimaryPro 50x Pre-Made Insulation Jacket (Trade Bulk Pack) | Condensate Pro Pipe Insulation 35mm x 13mm (IG001) | Condensate Pro Termination Kit (CPTERMKIT) | Primary Pro Bond and Seal 290ml (AS001) Show more